If Christianity were like Hinduism there would have been no Inquisition. The Cathars would have been accepted as non-Orthodox Christians and not exterminated. People would have been free to publish books saying that the earth went round the sun. The response to Heretics would be to argue against them rather than execute them. Even the extreme who reversed the rules of faith and held black mass would only be fought with words.
If Christianity were like Hinduism then everyone would accept that Mormons and Jehovas Witnesses were fellow Christians. The response to Waco would have been what had made someone’s Christian belief go so wrong, not to deny that they were Christians.
If Christianity were like Hinduism then Christians would see continuity with the Jewish faith, Kabbalists and Jews would be seen as traditional and mystic branches of the religion. Christians would acknowledge the link with Mithras and with Greep philosophy and feel pride in their long heritage and how their faith evolved.
If Christianity were like Hinduism and Islam were like the beliefs that sprung from Hinduism, then the only conflicts with Muslims would be over land and politics. Religion would be a healing rather than a dividing factor. The biggest religious disagreement would be that some Christians would say they were an unorthodox branch of Christianity whereas they would prefer to think of themselves as a separate religion.
If Christians were like Hindus they would celebrate the different faiths in the world, not demonise them. They would hold their faith firm but take interest in other beliefs. They would be concerned about their own spiritual progress, rather than thinking that they were saved and it was a done deal. They would offer their teachings to those who wanted to learn, but not force them on those who took no interest.